Apparatus for diagnosing abnormality of battery cell and method thereof
AssigneesHyundai Motor Company, Kia Corporation
InventorsHyun Jun Jang, Chang Ho Jung, Si Joong Kim, Hyun Jun Jo, Woo Sung Kim, Tae Kyu Kang
Life of this patent
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Abstract
An apparatus for diagnosing an abnormality of a battery cell and a method thereof may prevent thermal runaway of the battery cell in advance by generating an incremental capacity analysis (ICA) profile corresponding to each battery cell in a process of charging a plurality of battery cells, setting at least one voltage section within each ICA profile, determining a relative comparison value of an ICA value for each voltage section, and diagnosing an abnormality of each battery cell based on the relative comparison value of the ICA value.
Claims18
An apparatus for diagnosing an abnormality of a battery cell, the apparatus comprising:
- a battery including a plurality of battery cells;
- and
- a controller configured to generate an incremental capacity analysis (ICA) profile representing an amount of change in capacity compared to an amount of change in voltage of each battery cell in charging the battery, set at least one voltage value section within each ICA profile, determine a relative comparison value (RCA) of an ICA value for each voltage value section, and diagnose an abnormality of each battery cell based on the relative comparison value of the ICA value,
- wherein the controller is configured to obtain the RCV of the ICA value for each voltage value section based on following Equation 1,
- RCV
- =
- (
- (
- a
- 1
- -
- A
- )
- A
- ×
- 100
- )
- +
- 100
- [
- Equation
-
- 1
- ]
- where ‘A’ represents an average of the ICA value of each battery cell for each voltage value section, and a1 represents an ICA value of an arbitrary battery cell, and
- wherein the controller is further configured to count a relative comparison value that exceeds a first threshold value among relative comparison values of ICA values for each voltage value section, and diagnose that an abnormality occurs in a battery cell whose counting number exceeds a reference number, among the plurality of battery cells.
A method of diagnosing an abnormality of a battery cell, the method comprising:
- generating, by a controller, an incremental capacity analysis (ICA) profile representing an amount of change in capacity compared to an amount of change in voltage of each battery cell in charging a battery including a plurality of battery cells;
- setting, by the controller, at least one voltage value section within each ICA profile;
- determining, by the controller, a relative comparison value of an ICA value for each voltage value section;
- and
- diagnosing, by the controller, an abnormality of each battery cell based on the relative comparison value of the ICA value,
- wherein the determining of the relative comparison value of the ICA value includes:
- obtaining, by the controller, the relative comparison value (RCV) of the ICA value for each voltage value section based on following Equation 1,
- RCV
- =
- (
- (
- a
- 1
- -
- A
- )
- A
- ×
- 100
- )
- +
- 100
- [
- Equation
-
- 1
- ]
- where ‘A’ represents an average of the ICA value of each battery cell for each voltage value section, and a1 represents an ICA value of an arbitrary battery cell, and
- wherein the diagnosing of the abnormality of each battery cell includes:
- counting, by the controller, a relative comparison value that exceeds a first threshold value among relative comparison values of ICA values for each voltage value section;
- and
- diagnosing, by the controller, that an abnormality occurs in a battery cell whose counting number exceeds a reference number, among the plurality of battery cells.
Dependencies are inferred from the claim text.